Parisia deharvengi, Cai & Ng, 2009

Cai, Y. & Ng, P. K. L., 2009, The freshwater shrimps of the genera Caridina and Parisia from karst caves of Sulawesi Selatan, Indonesia, with descriptions of three new species (Crustacea: Decapoda: Caridea: Atyidae), Journal of Natural History 43 (17 - 18), pp. 1093-1114 : 1110-1113

Parisia deharvengi sp. nov.

( Figure 10 )

Material examined

Holotype: female, cl 3.4 mm, MZB, Gua (cave) Tanette, Kappang , Maros , Sulawesi, coll. P. Leclerc , 12 July 1989.

Description

Rostrum very short, unarmed, reaching near to end of eyes. Antennal spine fused with inferior orbital angle, raised slightly; pterygostomian margin rounded.

Sixth abdominal somite 0.53 times length of carapace, 1.5 times as long as fifth somite, as long as telson. Telson 2.4 times as long as wide, not terminating in a projection, with five pairs of dorsal spinules and one pair of dorsolateral spinules; distal end with five pairs of spines, lateral pair distinctly longer than intermediate pairs. Preanal carina low, without spine.

Eyes reduced, anterior end pointed, reaching to 0.4 times length of basal segment of antennular peduncle. Antennular peduncle 0.5 times as long as carapace; basal segment of antennular peduncle as long as combined lengths of second and third segment, anterolateral angle reaching to 0.25 times length of second segment, second segment as long as third segment. Stylocerite reaching to 0.6 times length of basal segment of antennular peduncle. Scaphocerite 3.3 times as long as wide.

Incisor process of mandible ending in irregular teeth, molar process truncated. Lower lacinia of maxillula broadly rounded, upper lacinia elongated, with a number of distinct teeth on inner margin, palp slender. Upper endites of maxilla subdivided, palp short, scaphognathite tapering posteriorly with numerous long, curved setae at posterior end. Palp of first maxilliped ending in a triangular structure. Podobranch of second maxilliped incompletely reduced. Third maxilliped reaching to end of scaphocerite, with ultimate segment slightly shorter than penultimate segment.

Third maxilliped with one arthropod. No arthrobranch at base of first pereiopod. Epipod present on first four pereiopods. First pereiopod reaching to end of second segment of antennular peduncle; merus 2.8 times as long as broad, as long as carpus; carpus excavated anteriorly, shorter than chela, 2.8 times as long as high; chela 2.2 times as long as broad; fingers 1.5 times as long as palm. Second pereiopod reaching to end of antennular peduncle; merus slender, as long as carpus, 5.4 times as long as broad; carpus 1.2 times as long as chela, 4.9 times as long as high; chela 2.4 times as long as broad; fingers 1.6 times as long as palm. Third pereiopod reaching beyond end of scaphocerite by one-quarter of its propodus length, propodus 11 times as long as broad, 4.5 times as long as dactylus; dactylus 2.6 times as long as wide (spines included), terminating in one large, long claw, with three accessory spines on flexor margin. Fifth pereiopod reaching to end of scaphocerite, propodus 13 times as long as broad, 5.6 times as long as dactylus, dactylus 2.5 times as long as wide (spinules included), terminating in one large, long claw, with only five spines on flexor margin.

Uropodal diaeresis with eight movable spinules.

Habitat

Subterranean rivers.

Etymology

The species is named after Louis Deharveng, who has contributed substantially to our knowledge of the subterranean fauna of southern Sulawesi.

Remarks

Holthuis (1956) established a new genus, Parisia , for Caridina -like species that do not have an arthrobranch on the first pereiopod. So far, six species of Parisia , all subterranean, have been reported from Madagascar and Australia. Holthuis (1956) initially recognized three species from Madagascar, namely P. microphthalma ( Fage, 1946) , P. edentata Holthuis, 1956 , and P. macrophthalma Holthuis, 1956 , all collected from subterranean waters in total darkness. The eyes are strongly reduced and the pigmentation remains only as a very small spot in P. microphthalma and P. edentata , but is well-developed in P. macrophthalma . Williams (1964) described two more species, P. gracilis and P. unguis, from a cave in Northern Territory, Australia. Gurney (1984) added one more, P. dentata , to the subterranean fauna of Madagascar. Cai and Anker (2004) recently described P. macrophora from Luzon, Philippines. Parisia deharvengi sp. nov., differs from all the other species of Parisia by its short, sharp dactylus on the last three pereiopods, and the much smaller number of spines on the dactylus of the fifth pereiopod (five versus more than 30 in others).

Figures

Figure 10. Parisia deharvengi sp. nov. (A) Cephalothorax and cephalic appendages, (B) telson, (C) distal portion of telson, (D) scaphocerite, (E) maxillula, (F) maxilla, (G) first maxilliped, (H) second maxilliped, (I) third maxilliped, (J) first pereiopod, (K) second pereiopod, (L) third pereiopod, (M) dactylus of third pereiopod, (N) fifth pereiopod, (O) dactylus of fifth pereiopod, (P) diaeresis. Scale bars: A, 1 mm; B, D–L, N, 0.5 mm; C, P, 0.2 mm; M, O, 0.1 mm. (Holotype, female, cl 3.4 mm, ZMB, Gua (cave) Tanette, Kappang, Maros, Sulawesi.)