70 



R. HUYS AND W. LEE 



aberrant setal formula most likely resulted from imperfect dissec- 

 tion. In addition, he suspected that Mourephonte was a junior 

 subjective synonym of Esola and claimed that M. catharinensis was 

 probably nothing more than an inadequately illustrated specimen of 

 Esola longicauda. Lang (1965) pointed out that Jakobi's species had 

 already been described as Laophonte longiseta by Nicholls (1941a) 

 and regarded the absence of the P2 endopod and the reduced 

 armature of P2-P4 as sufficient grounds to maintain Mourephonte as 

 a distinct genus. 



Jakobi's material, consisting of an unspecified number of males 

 collected from the tidal zone at Itapocoroy and Porto Belo, is no 

 longer extant, the only specimen available being Nicholls' holotype 

 male of L. longiseta deposited in the South Australian Museum, 

 Adelaide. This specimen forms the basis of the redescription given 

 below. The female is as yet unknown. 



Diagnosis (based on 8 only). Laophontidae. Body cylindrical. 

 Integument of cephalothorax and body somites with dense pattern of 

 spinules and setules. Rostrum large, partly delimited at base. Cup- 

 shaped pores present both anterodorsally and anteroventrally on 

 cephalic shield, laterodorsally on caudal rami; absent on genital 

 somite. Anal operculum dentate. Caudal rami rectangular, short. 



Sexual dimorphism in antennule, P3 endopod, P5, P6, genital 

 segmentation and caudal rami. 



Antennules slender; haplocer and 7-segmented in 8; segment 1 

 with 2 small processes along posterior margin; swollen segment 5 

 with very long aesthetasc (fused basally to 2 setae) but without 

 distinct anterior outgrowth. Antenna with 4 setae on exopod; allobasis 

 with abexopodal seta. Labrum with marginal spinules distally. Man- 

 dible with small 1 -segmented palp bearing 1 lateral and 3 apical 

 setae. Maxillule without defined exopod, represented by 1 setae. 

 Maxilla with 3 endites on syncoxa; endopod represented by 4 setae. 

 Maxilliped slender; syncoxa with 2 setae; entire palmar margin with 

 spinules; endopodal claw elongate. 



PI very large compared to other legs; with 2-segmented exopod 

 bearing 4-5 setae on exp-2 and elongate endopod; enp- 1 without 

 inner seta, enp-2 with minute seta and long, slender claw. P2-P4 

 with 3-segmented exopods; endopods entirely absent (P2) or 2- 

 segmented (P3-P4). Bases with plumose (P2) or naked (P3-P4) 

 short outer seta. P2-P4 without inner setae on exp-2 and -3. P4 enp- 

 2 with widely separated apical setae. P3 endopod 8 indistinctly 

 3-segmented with incomplete surface suture between enp-2 and -3; 

 enp-2 with inner seta and short outer, spinous apophysis. Armature 

 formula as follows: 



Exopod 



Endopod 



P2 

 P3 

 P4 



0.0.022 

 0.0.022 

 0.0.022 



1.1.110 [in 9presumably 1.211] 

 0.111 



P5 8 without endopodal lobe; exopod short, with 1 inner, 2 apical 

 and 2 outer setae/spines. 



P6 9 asymmetrical; membranous flaps with 2 setae arising from 

 cylindrical process. 



Type and ONLY SPECIES. Laophonte longiseta Nicholls, 1 94 1 a = 

 Mourephonte longiseta (Nicholls, 1941a) 



Mourephonte longiseta (Nicholls, 1941a) 



Laophonte longiseta Nicholls, 1941a 

 Mourephonte catharinensis Jakobi, 1953 



TYPE LOCALITY. Tidal zone at Itapocoroy and Porto Belo, Santa 



Catarina State, Brazil; holdfasts of Endocladia and Codium. 



Material examined. South Australian Museum, Adelaide: 

 Holotype 8 of Laophonte longiseta, dissected on slide Tc 13437 

 (SAM C5550); Sellick Beach, south of Port Willunga, South Aus- 

 tralia; coll. H.M. Hale, 3 1 January 1937, from a stone in 1 .5 m at low 

 tide on south edge of reef. Jakobi's (1953) type material of M. 

 catharinensis is lost. 



Redescription. 



FEMALE. Unknown. 



MALE. Body length 0.25 (Jakobi, 1953) to 0.30 mm (Nicholls, 

 1941a). Cephalic shield with paired cup-shaped pores both 

 anterodorsally and anteroventrally on either side of rostrum. 



Antennule (Fig. 14A-F) 7-segmented, haplocer; geniculation 

 between segments 5 and 6; proximal segments without conspicuous 

 spinous processes but segment 1 with 2 small protuberances; seg- 

 ment 1 with spinular row distally and tiny spinules along anterior 

 margin; segment 2 longest; segment 5 with very long aesthetasc 

 (150 urn). Armature formula: 1-[1], 2-[8 + 1 pinnate], 3-[6], 4-[2], 5- 

 [8+1 pinnate + 1 spine + (2 + ae)], 6-[l + modified seta], 7-[7 + 

 acrothek]. Acrothek consisting of 2 basally fused setae. 



Antennary exopod (Fig. 13D) with 2 pinnate setae laterally and 2 

 pinnate spines distally. 



Labrum with marginal spinules distally; without overlapping 

 scales. 



Mandibular palp (Fig. 13C)1 -segmented, bilobate, rami com- 

 pletely incorporated; with 1 pinnate seta laterally (probably basal in 

 origin) and 3 bare setae distally (representing incorporated endopod). 

 Maxillule and maxilla as in the genus Esola. 



Maxilliped (Fig. 13B) slender; syncoxa with 3 spinular rows and 

 2 pinnate setae; basis elongate, with long spinular row on palmar 

 margin and spinular patch on outer margin; endopod represented by 

 tiny setule and very long claw, exceeding length of basis. 



PI (Fig. 13A) large compared to P2-P4; protopodal segments 

 with rows and patches of fine spinules as illustrated; basis with outer 

 spine near joint with coxa and inner pinnate spine on anterior 

 surface. Exopod 2-segmented, exp-1 with pinnate outer spine; exp-2 

 with 2 spines and 3 geniculate setae. Endopod very long; enp-1 

 without inner seta; enp-2 with 3 spinular rows, 1 setule and long, 

 denticulate claw. 



P2-P4 (Fig. 14G-I) with 3-segmented exopods; endopod 2- 

 segmented (P3-P4) or entirely absent (P2). P3 enp-2 partly 

 subdivided along anterior surface by short transverse suture; apo- 

 physis on outer margin short and slightly sigmoid, bare. P4 enp-2 

 with apical setae widely separated and flanking secretory tube-pore. 

 Armature formula of P2-P4 as for genus. 



P5 (Fig. 14J) with baseoendopod fused to somite, endopodal lobe 

 not developed. Exopod rectangular; with 2 outer, 1 apical and 2 

 inner setae. P6 asymmetrical, produced into cylindrical process at 

 outer corner, bearing long apical and shorter inner seta. 



Pleural areas of genital somite without modified pores. Posterior 

 margins of abdominal somites with row of long spinules (Fig. 13F). 

 Anal operculum dentate (Fig. 13E). 



Caudal rami (Fig. 13E-F) short, about 1.3 times as long as wide; 

 with 6 setae (seta I absent), seta VII tri-articulate at base and 

 plumose, setae IV and V well developed and fused at base. Inner 

 proximal margin with cup-shaped depression (specialized pore) 

 dorsally, marked by row of tiny spinules set on strongly chitinized 

 margin; cup filled with secretory substance. 



Remarks. Neither Jakobi (1953) nor Nicholls (1941a) illustrated 

 cup-shaped pores on the cephalic shield. Vervoort (1964) pointed 

 out that Jakobi had shown an anteriorly directed middorsal spinous 



