Siphonorhinidae Cook, 1895, 2023

Moritz, Leif & Parra-Gomez, Antonio, 2023, Notorhinus floresi sp. nov. gen. nov.: The first records of Siphonophorida in Chile and Siphonorhinidae in South America (Colobognatha), Arthropod Systematics & amp; Phylogeny 81, pp. 565-579 : 565

3.1.1. Family Siphonorhinidae Cook, 1895

Remarks.

The specimens ( Notorhinus floresi sp. nov. and Notorhinus sp. (MNHNC 8390)) can be placed in the family Siphonorhinidae based on the following characters: Head pyriform, not extended into beak (rostrum) (Figs 3A , 8A ); antennae elbowed; antennomere 2 longer than wide (Figs 3B , 8C ); gnathochilarium consisting of separate plates (Figs 3G , 8B ); anterior margin of collum straight (compare Enghoff et al. 2015; Marek et al. 2016). According to a key provided by Shelley (1996: 23) members of the family Siphonorhinidae lack sensory pits on antennomeres 5 and 6 (see also Marek et al. 2012), as is the case in the specimens studied here (Figs 3E , 8C ). However, lack of these sensory pits seems to apply only to the North American genus Illacme ( Marek et al. 2012, 2016), the Malagasy genus Madagascarhinus ( Wesener 2023) and the South African genus Nematozonium ( Shelley and Hoffman 2004), as these sensory pits have been reported for Siphonorhinus ( Attems 1930, 1938) and Kleruchus (Attems, 1938).

Figures

Figure 3. Notorhinus floresi sp. nov., male holotype (MNHNC 8387), head, SEM. A Head, frontal view. B Head, lateral view. C Labrum, frontal view. D Labrum and gnathochilarium, ventral view. E Apical antennomeres, lateral view. F Apical antennomere, apical view. G Gnathochilarium and leg-pair 1, ventral view. Abbreviations: I-VII = antennomeres, ac = apical cones, cl = claw, co = collum, cx = coxa, ep = epicranium, fe = femur, fh = forehead, ge = genae, in = inscision of the labrum, la = labrum, LL = lamella lingualis, lp = spinous protuberences of labrum, lt = teeth lining labral incision, me = mentum, pa = palp-like structure, po = pores of the salivary glands, pof = postfemur, prf = prefemur, sb = sensilla basiconica, ssb = spiniform sensilla basiconica, sti = gnathochilarial stipes, ta = tarsus, ti = tibia.

Figure 8. Notorhinus sp., female (MNHNC 8390), SEM. A Head and anterior body-rings, frontal view. B Apical parts of gnathochilarium and labrum, ventral view. C Left antenna, lateral view. D Antennomere 7 with apical sensory structures. E Tarsal claw of mid-body leg. F Mid-body tergite, dorsal view. G Ozopore, lateral view, arrows indicate spines behind ozopore. H Posterior tergal margin (limbus), dorsal view, arrow indicates fluke-shaped sculpture. I Posterior body-rings and telson, ventral view. Abbreviations: I-VII = antennomeres, ac = apical cone, cl = tarsal claw, co = collum, ep = epicranium, fh = forehead, gn = gnathochilarium, hp = hypoproct, L 1 = leg-pair 1, L 2 = leg-pair 2, la = labrum, LL = lamella lingualis, md = mandible gnathal lobe, me = mentum, mz = metazonite, oz = ozopore, pp = paraproct, pr = preanal ring, pz = prozonite, sb = sensilla basiconica, ssb = spiniform sensilla basiconica, sti = gnathochilarial stipes, ta = tarsus.