A general revision of the Palaemonidae (Crustacea decapoda natantia) of the Americas. 2. The subfamily Palaemoninae, p. 5 |
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NO. 12 HOLTHUIS : PALAEMONIDAE OF AMERICAS, PART II 5
The eyes are well developed and well pigmented.
The anterolateral spine of the basal segment of the antennular
peduncle is very strong and reaches beyond the second segment of that
peduncle. The inner antennular flagellum has the 2 rami fused for 8
to 23 joints, the free part of the shorter ramus being about as long as
or slightly longer than the fused portion.
The scaphocerite is about thrice as long as broad. The final tooth
overreaches the anterior margin of the lamella. The outer margin is
concave.
The mandible is provided with a three-jointed palp. Exopods are
present on all maxillipeds. Pleurobranchs may be found on the third
maxilliped and all pereiopods.
The first legs are slender. The fingers are longer than the palm and
the carpus is slightly longer than the chela. The second legs are much
stronger than the first. They are smooth and reach with part of the
carpus beyond the scaphocerite. The fingers are slightly shorter than the
palm; in adult males, however, they sometimes only are half as long as
the palm. The cutting edge of the dactylus bears 2 to 4, that of the
fixed finger 2 small teeth in the proximal part. In the adult male the
fingers gape strongly, the gap then being filled with hairs. The carpus
is very short and cupshaped, it is about half as long as the merus. The
last three legs are slender. The dactylus is biunguiculate. Spines only are
present on the posterior margin of the propodus. The propodus of the
fifth leg bears a row of hairs at the posterior part of the distal margin.
The first pleopod of the male is provided with an appendix interna.
The uropods are normal in shape.
Size: The specimens of the Allan Hancock Expeditions vary in
size between 16 and 47 mm. The ovigerous females measure 21 to 47
mm. According to Kemp (1925) full grown specimens may attain a
length of 65 mm. The eggs are numerous and small, being 0.5 to 0.7
mm in diameter.
Colour: According to notes made by the collectors during the
Allan Hancock Expeditions the body is dark blue green, mottled with
whitish. The palm of the chela is uniform blue green, the fingers are
barred. The fringes of the tail fan, of the scaphocerite, the antennulae
and the antennae are close to Chinese orange. Another specimen was
stated to be colourless, whitish with slight tawny tinged spots. In the
spirit specimens, which are evenly pale brownish yellow, the tips of the
fingers generally are coloured brownish red, while behind these coloured
tips and separated from them by a colourless band, a band of much
Object Description
Description
| Title | A general revision of the Palaemonidae (Crustacea decapoda natantia) of the Americas. 2. The subfamily Palaemoninae, p. 5 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-OP-12~007.tiff |
| Full text | NO. 12 HOLTHUIS : PALAEMONIDAE OF AMERICAS, PART II 5 The eyes are well developed and well pigmented. The anterolateral spine of the basal segment of the antennular peduncle is very strong and reaches beyond the second segment of that peduncle. The inner antennular flagellum has the 2 rami fused for 8 to 23 joints, the free part of the shorter ramus being about as long as or slightly longer than the fused portion. The scaphocerite is about thrice as long as broad. The final tooth overreaches the anterior margin of the lamella. The outer margin is concave. The mandible is provided with a three-jointed palp. Exopods are present on all maxillipeds. Pleurobranchs may be found on the third maxilliped and all pereiopods. The first legs are slender. The fingers are longer than the palm and the carpus is slightly longer than the chela. The second legs are much stronger than the first. They are smooth and reach with part of the carpus beyond the scaphocerite. The fingers are slightly shorter than the palm; in adult males, however, they sometimes only are half as long as the palm. The cutting edge of the dactylus bears 2 to 4, that of the fixed finger 2 small teeth in the proximal part. In the adult male the fingers gape strongly, the gap then being filled with hairs. The carpus is very short and cupshaped, it is about half as long as the merus. The last three legs are slender. The dactylus is biunguiculate. Spines only are present on the posterior margin of the propodus. The propodus of the fifth leg bears a row of hairs at the posterior part of the distal margin. The first pleopod of the male is provided with an appendix interna. The uropods are normal in shape. Size: The specimens of the Allan Hancock Expeditions vary in size between 16 and 47 mm. The ovigerous females measure 21 to 47 mm. According to Kemp (1925) full grown specimens may attain a length of 65 mm. The eggs are numerous and small, being 0.5 to 0.7 mm in diameter. Colour: According to notes made by the collectors during the Allan Hancock Expeditions the body is dark blue green, mottled with whitish. The palm of the chela is uniform blue green, the fingers are barred. The fringes of the tail fan, of the scaphocerite, the antennulae and the antennae are close to Chinese orange. Another specimen was stated to be colourless, whitish with slight tawny tinged spots. In the spirit specimens, which are evenly pale brownish yellow, the tips of the fingers generally are coloured brownish red, while behind these coloured tips and separated from them by a colourless band, a band of much |
| Archival file | hancockunpub_Volume31/AHF-PUB-OP-12~007.tiff |
