Orcovita angulata Ng, Guinot & Iliffe, 1996

Stasolla, Gianluca & Innocenti, Gianna, 2014, A new species of cavernicolous crab from Coron Island, Palawan, the Philippines (Decapoda: Brachyura: Varunidae), Raffles Bulletin Of Zoology 62, pp. 591-599 : 592-595

Orcovita angulata Ng, Guinot & Iliffe, 1996

( Figs. 3 , 4 )

Orcovita angulata Ng, Guinot & Iliffe, 1996: 129 , figs. 2b, 16.

Material examined. 1 male (16.2 × 11.7 mm) ( MZUF 4268 ), Philippines, Coron Island , Pukaway Cave, coll. R. Berti & S .

Meggiorini, 15 March 1991.

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row of rounded granules present just below infraorbital margin on suborbital region, extending to sub-branchial region. Antennules broad. Antennal articles entering orbital hiatus. Eyes developed, cornea pigmented.

Epistome ( Fig. 3C ) narrow, posterior margin with one lateral cleft, median part broadly triangular, margin smooth. Third maxilliped ( Fig. 4F ) with broad, stout exopod, as narrow as ischium of endopod, flagellum well developed; ischium stout; merus broad, antero-external angle edge gently granulate, auriculiform.

Male chelae ( Fig. 4D, E ) subequal, fingers as long as palm; proximal region of cutting edges of fingers with very small pulvinus. Margins of merus serrated. Carpus rounded, serrated, inner distal angle with low, obtuse tooth. Chelipeds relatively long, surface of articles smooth, without any traces of a longitudinal sulcus; tips of fingers corneous, spoon-like, outer surface of tips of finger with dense, short setae.

Ambulatory legs ( Fig. 4G, H ) flattened in cross section, all articles very long, slender; third ambulatory leg longest; surface smooth. Anterior dorsal margin of merus with acute, inconspicuous subdistal tooth; anterior, posterior margins of propodus with short and long setae, respectively; dactylus slender, with acute tip. Dactylus slightly rectangular in cross section, flexor margin comb-like in the first three pereiopods; 3M long, slender (length to width ratio 5.4), 3P long, slender (length to width ratio 5.1), 3D very long, slender (length to width ratio 12.4); 4M long, slender (length to width ratio 4.9), 4P long (length to width ratio 3.2), 4D long, slender (length to width ratio 7.3) (see Table 1). Male abdomen

593

width / length) dactylus

=

D

,

propodus

=

P

,

merus

= M

(

legs

th

4

and

rd

3 the For

.

characters morphological various

of

Philippines

the

from Orcovita

of

species known

the

among Comparisons. indicated

. 1 are

Table ratio

Stasolla & Innocenti: A new species of Orcovita from the Philippines

.

sp. n

tabiacoud O. 2 broad broad very no setae but long stout absent smooth 1.38 4.33 4.15 6.69 4.07 3.04 5.30

tips

cheliped

) male

on slender

(broad setae and

angulata and short long

. O 2 broad acute dense very absent serrated 1.30 5.44 5.14 12.48 4.94 3.22 7.33) female

(setae slender low

angulata broad soft, and and

O. 2 broad very short long weak serrated 1.3 5.4 5.4 16.1 4.6 3.7 6.6 pulvinus

the stout

on and

strong setae short

holthuisi . O 3 narrow and acute dense long relatively present smooth 1.2 4.3 3.9 8.1 3.9 2.7 2.2 setae slender

fictilia soft, and

O. 2 broad broad short long absent granular 1.5 1.3– 5.3 4.2 9.1 4.2 4.4 – – 2.6 3.0 – 6.9 6.2 carpus

cheliped ratio

the male carapace teeth shape teeth chelipeds legs cristae of length

Anterolateral Carapace Anterolateral Male Ambulatory Epigastric Inner margin to Width M P D M P D

( Figs. 3B , 4B ) narrowly triangular; lateral margins covered with short, rare setae; first abdominal somite, distal margin concave, swollen laterally lateral margin; second abdominal somite narrow, short, proximal margin concave; third abdominal somite broad; fourth abdominal somite broader; fifth abdominal somite with proximal and distal margins gently sinuously; sixth abdominal somite with proximal and distal margins slightly convex and concave medially respectively, lateral margins weakly convex; telson with lateral margins weakly concave, distal margin rounded. G1 ( Fig. 4I ) slender, gently curving outwards, reaching to or slightly beyond anterior margin of sternite 5, proximal part swollen; terminal lobe elongate; subterminal lobe densely setose. G2 ( Fig. 4L ) short, small.

Colour. Unknown. The preserved specimens are uniformly yellowish white.

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Figures

Fig. 3. Orcovita angulata, male (16.2 × 11.7 mm) (MZUF 4268).

Fig. 4. Orcovita angulata, male (16.2 × 11.7 mm) (MZUF 4268); A, carapace; B, abdomen; C, epibranchial region; D, dorsal view of right cheliped; E, dorsal view of carpus of cheliped; F, third maxilliped; G, right third ambulatory leg; H, right fourth ambulatory leg; I,