Sicyonia stimpsoni Bouvier 



Figure 29 



Sicyonia stimpsoni Bouvier, 1905, p. 748. — Holthuls, 1959, 

 p. 75. 



Sicyonia dorsalis: Milne Edwards and Bouvier, 1909, p. 253, 

 text-flgs. 86-88, pi. 8, flgs. 4-13. 



Eusicyonia stimpsoni: Burkenroad, 1934b, p. 121 (notes). — 

 1939, p. 57. 



Eusicyonia edwardsii: Sehmltt, 1935a, p. 133, 8g. 6. 



Recognition characters. — Rostrum usually ele- 

 vated at considerable angle, extending variable 

 distance beyond eye; with three dorsal teeth not 

 counting tip, posterior tooth in front of orbital 

 margin separated by a variable distance from 

 anterior carinal tooth of carapace; tip often 

 appearing bifurcate but a third ventral tooth 

 present behind or below level of anterior cleft; 

 a slight ridge on lateral surface running parallel 

 with ventral margin. Postrostral carina with two 

 teeth, anterior tooth before level of hepatic spine, 

 posterior tooth behind midpoint ; sometimes rudi- 

 ment of a third tooth appearing as a minute crest- 

 like swelling with truncated anterior edge a little 

 in front of posterior tooth. Antennal angle armed 

 with a spine. 



Abdominal segments with conspicuous tergal 

 carinae. First segment with carina produced into 

 an elevated anterior tooth. Margins of dorsal 

 notches at posterior ends of segments three to five 

 produced as short angular projections. A tooth 

 at posterior end of fourth to sixth segments. Seg- 

 ments one to four with a ventral spine on pleura ; 

 segments five and six with spine at posteroventral 

 corner. Second abdominal segment with pleural 

 groove curving forward midlaterally, not connect- 

 ed to short tergal groove curving downward and 

 backward. 



Figure 29. — Sicyonia stimpsoni Bouvier. Carapace 

 and ixjrtion of first abdominal segment in lateral 

 view, 2 mm. indicated (after Lunz, 1945). 



Petasma of male with distoventral lobe not 

 forked. 



Measurements. — Length of body : male, 14 mm. ; 

 female, 60 mm. 



Variations. — Pleural spines may be absent in 

 young individuals. 



Color. — Branchial region of carapace with 

 orange, or brownish and yellowish-white ring in 

 posterior half (Holthuis, 1959). North Carolina 

 specimens show a purple spot with surrounding 

 vermilion ring in this region. 



Habitat. — Found on predominantly mud and 

 shell bottom in Surinam (Holthuis, 1959); shal- 

 low water to 230 fathoms. 



Type locality. — Off Barbados, British West 

 Indies, lat. 13°03'05" N. long. 59°36'18" W., depth 

 103 fathoms. 



Known range. — Cape Hatteras, N.C., to 

 Campeche Gulf; West Indies to French Guiana. 



Remarks. — Among species of Sicyonia occur- 

 ring in the Carolinas, the only detailed description 

 of development is that given by Pearson (1939) 

 for this species. Eggs attributed to this species 

 were taken in inlets, and larval development (re- 

 constructed from plankton) proceeded through 

 five naupliar, three protozoeal, and two mysis 

 stages. Eggs were taken abundantly at St. Augus- 

 tine Inlet, Fla., in plankton, from March 30 to 

 August 8; they were taken in lesser abundance 

 from January to March, and August to Septem- 

 ber at Fort Pierce, Fla., and off Stono Inlet, S.C., 

 in September. Naupliar and protozoeal stages 

 were found from April to August, and mysis 

 stages were found in January and August- 

 September. Thus, the breeding season along that 

 stretch of coast lasts at least from January to 

 September. 



Holthuis (1959) noted that males in Surinam 

 material outnumbered females about 3 to 1. 



Family Sergestidae 



Penaeidea with last two pairs of legs reduced 

 in size or lost; gills few or lost. 



KEY TO SUBFAMILIES AND SPECIES IN THE 

 CAROLINAS 



a. Head not greatly elongated : gills present 



Sergestinae; Antes mnrricanus rarolinac (p. 39). 

 aa. Head greatly elongated ; gills absent 



Luciferinae ; Lucifrr f<i.r<mi (p. 40). 



38 



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