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Key to Oratosquilla

Key to Species Groups in Oratosquilla

1. Mandibular palp absent; submedian, intermediate, and lateral carinae of anterior 3 abdominal somitet unarmed ' (2 epipods present; dactylus of claw with 7-8 teeth).... Indica Group

Mandibular palp present; some carinae of anterior 3 abdominal somites with posterior spines (usually 4 epipods present; dactylus of claw with 5, 6, or 10-18 teeth)........ 2

 

2. Anterior bifurcation of median carina of carapace opening posterior to dorsal pit; cornea small (corneal index 600 or more in adults), set transversely on stalk............ Nepa Group

Anterior bifurcation,of median carina of carapace absent or opening anterior to dorsal pit; cornea large (corneal index less than 600 in adults), set obliquely on stalk ......... 3

 

3. Lateral process of fifth thoracic somite composed of 2 slender, sharp spines directed laterally; lateral carinae of anterior 5 abdominal somites bicarinate ..........Mikado Group

Lateral process of fifth thoraci4t somite not composed of 2 slender, sharp spines; lateral carinae of anterior 5 abdominal somites, simple, not bicarinate....... 4

 

4. Cornea expanded, very large, width about one-third carapace length; dactylus of claw with 10-18 teeth (rostral plate without median carina)....................... Investigatoris Group

Cornea width less than @ one-third carapace length (if @ cornea equal to or greater than one third carapace length, then rostral plate with median carina); dactylus of claw with 5 or 6 teeth....... 5

 

5. Median carina of carapace entire, with well-formed anterior bifurcation (dactylus of claw with 6 teeth)......................... Oratorio Group

Median carina of carapace interrupted at base of bifurcation or branches of bifurcation ........... 6

 

6. Anterior branches of bifurcation of median carina of carapace present, well formed (dactylus of claw with 6 teeth)............................. Perpensa Group

Anterior branches of,bifurcation of median carina of carapace completely absent, area of bifurcation usuallyi smooth, polished (occasionally arms of bifurcation represented by broken lines of tubercles or by lines of pigment; entire branches rarely present) ............................ 7

 

7. Anterior width of carapace greater than one-half median length; dactylus of claw with 6 teeth ...................... Woodmasoni Group

Anterior width of carapace less than one-half median length; dactylus of claw with 5 teeth.....Gonypetes Group

 

Key to Species of the Nepa Group

Portion of median carina of carapace between cervical groove and anterior bifurcation simple, not bicarinate; submedian carinae of fourth abdominal somite armed posteriorly.......... 0. nepa (Latreille, 1828) [Kemp, 1913]

Portion of median carina of carapace between cervical groove and anterior bifurcation bicarinate; submedian carinae of fourth abdominal somite unarmed................ 0. holoschista (Kemp, 1911)

[Kemp, 1913]

 

Key to Species of the Mikado Group

Rostral plate with median carina; undivided portion of median carina of carapace, anterior to dorsal pit, about one-half as long as, bifurcated portion ................ 0. mikado (Kemp and Chopra, 1921)

Rostral plate without median carina; undivided portion of median carina of carapace, anterior to dorsal pit, about one-third as long as bifurcated portion......0. stridulans (Wood-Mason In Alcock, 1894)

[Kemp, 1913]

 

Key to Species of the Oratoria Group

1. Submedian carinae of fourth, fifth, and sixth abdominal somites with posterior spines.......... . 2

Submedian carinae of fourth abdominal somite unarmed, those of fifth and sixth somites only with posterior spines............. 3

 

2. Intermediate carinae of first abdominal somite armed posteriorly; anterior lobe of lateral process of seventh thoracic somite sharp................ 0. calumnia (Townsley, 1953)

Intermediate carinae of first abdominal somite unarmed; anterior lobe of lateral process of seventh somite rounded..................0.mauritiana (Kemp, 1913) [=Squilla juxtaoratoria Ward, 19421 [Manning, 1968b]

 

3. Lateral process of seventh thoracic somite not markedly bilobed; second and fifth ab dominal somites each with dark dorsal patch in preservative (merus of claw lacking inferodistal spine on outer face)............ 0. hempi (Schmitt, 1929) [Chopra, 1934)

Lateral process of seventh thoracic somite markedly bilobed-, second and fifth abdominal somites lacking dark dorsal patch (merus of claw with inferodistal spine on outer face) ...............0. oratorio (De Haan, 1844) [=Squilla affinis Berthold, 1845]

 

Key to Species of the Perpensa Group

1. Submedian carinae of fourth, fifth, and sixth abdominal somites armed posteriorly (dorsal ridge of carpus of claw tuberculate)...... 0. fabricii (Holthuis, 1941)

Submedian carinae of fourth abdominal somite unarmed............2

 

2. Lobe between spines of basal prolongation of uropod convex (dorsal ridge of carpus of claw tuberculate)......... 0. interrupta(Kemp, 1911)[Kemp, 1913]

Lobe between spines of basal prolongation of uropod concave, distal margin rounded or acute (dorsal ridge of carpus of claw smooth, entire)........3

 

3. Slender spine present between spines of basal prolongation of uropod (proximal segment of uropodal exopod 1.5 times as long as distal)....... 0. ornata, new species

At most a rounded lobe present between spines of basal prolongation of uropod (proximal segment of uropodal exopod subequal in length to distal).......4

 

4. Second and fifth abdominal somites with dark, median, rectangular patch of chromatophores (inferodistal angle on outer face of merus of claw rounded, unarmed)...........0. imperialis (Manning, 1965) (=0. simulans (Holthuis, 1967)

At most second abdominal somite with dark median patch of chromatophores (inferodistal angle on outer face of merus of claw with spine or blunt triangular prominence).................5

 

5. Rostral plate longer than broad; lateral carinae of second abdominal somite with posterior spine.............0. inornata (Tate, 1883) [Manning, 1966]

Rostral plate broader than long; lateral carinae of second abdominal somite unarmed..............O. perpema (Kemp, 1911) [=O. anomala (Tweedie, 1935)]

[Kemp, 1913; Manning, 1966]

 

Key to Species of the Woodmasoni Group

1. Dorsal surface of telson with longitudinal row of tubercles, converging distally, on each side of median carina............2

Dorsal surface of telson not ornamented with line of tubercles on each side of median carina.............. 3

 

2. Lateral margins of rostral plate straight; submedian carinae of abdomen divergent on each somite, particularly on fourth and fifth somites; telson with 1 row of tubercles flanking median carina on each side......0. hesperia (Manning, 1968)[Tirmizi and Manning, 1968]

Lateral margins of rostral plate sinuous; submedian carinae of abdomen subparallel; telson with 2 rows of tubercles flanking median carina on each side...........0.massavensis (Kossmann, 1880)[Ingle, 1963]

 

3. Submedian carinae of fourth, fifth, and sixth abdominal somites each with posterior spine; angular lobe present between apical spines of basal prolongation of uropod........... 0. tweediei, new species

Submedian carinae of fifth and sixth somites only armed with spines; low, inconspicuous rounded lobe present between spines of basal prolongation of uropod...............0.woodmasoni (Kemp, 1911)[Kemp, 1913]

 

Key to Species of the Gonypetes Group

1. Rostral plate with median carina; lateral process of seventh thoracic somite not bilobed (eyes very large, cornea width about one-third carapace length) ...............0.quadraticauda (Fukuda, 1911) (=Squilla boops Kemp, 1911) (Kemp, 1913]

Rostral plate without median carina; lateral process of seventh thoracic somite bilobed (eyes of moderate size, cornea width less than one-fourth carapace length).............. 2

 

2. Outer face of merus of claw with tooth at inferodistal angle; anterior lobe of lateral process of seventh thoracic somite short, not exceeding half of length of posterior lobe..............0. quinquedentata (Brooks, 1886)

Outer face of merus of claw unarmed inferodistally; anterior lobe of lateral process of seventh thoracic somite more than half as long as posterior lobe..........0. gonypetes (Kemp, 1911)(Kemp, 1913]

 

Reference:

Manning RB (1971). Keys to the species of Oratosquilla. Smith Cont Zool #71.

 

Web Site Author: A. San Juan
Site Created February 3, 1998
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