Megalomma lobiferum ( Ehlers, 1887 )

Tovar-Hernández, María Ana & Carrera-Parra, Luis F., 2011, Megalomma Johansson, 1925 (Polychaeta: Sabellidae) from America and other world-wide localities, and phylogenetic relationships within the genus 2861, Zootaxa 2861 (1), pp. 1-71: 39-40

publication ID

http://doi.org/ 10.11646/zootaxa.2861.1.1

persistent identifier

http://treatment.plazi.org/id/03CF87C4-2958-1245-FF5C-5EB3FEF54091

treatment provided by

Felipe

scientific name

Megalomma lobiferum ( Ehlers, 1887 )
status

 

Megalomma lobiferum ( Ehlers, 1887)  

Figure 8B–C View FIGURE 8 , 16A–H View FIGURE 16 , 28D–E View FIGURE 28

Branchiomma lobiferum Ehlers, 1887: 254–259   , Pl. 53, Figs 10–15 View FIGURE 10 View FIGURE 11 View FIGURE 12 View FIGURE 13 View FIGURE 14 View FIGURE 15 .

Megalomma lobiferum   .— Johansson, 1927: 132.— Hartman, 1951: 115.— Hartman, 1959: 550.— Perkins, 1984: 354–357, Figs 39–40.— Tovar-Hernández and Salazar-Vallejo, 2006: 42–43, Fig. 10 View FIGURE 10 .— Tovar-Hernández and Salazar-Vallejo, 2008: 1961, 1963–1964, Figs 3–5 View FIGURE 3 View FIGURE 4 View FIGURE 5 .

Type material examined. [ MCZ] 835, holotype, Florida, Key West , 1.82–3.6 m   .

Additional material examined. [ ECOSUR] Mexican Caribbean , RIA 1 View Materials , May 30, 2005 (2 specs) Cayo Valencia, Quintana Roo, Coll. SISV, April 29, 1983 (1 spec.)   . Xcacel, Quintana Roo. Coll. SISV, April 3 1992 (1 spec.)   . [ ECOSUR] OH-P0283, Quintana Roo, Isla Contoy, Northern point pier, 21° 31’ 43.8’’ N, 86° 48’ 10.1’’ W, Colls. SISV & LFCP, February 23, 2008 (1 spec) GoogleMaps   . [ ECOSUR] OH-P0286, Quintana Roo, Isla Contoy, Ixlache reef, 21° 26’ 2.5’’ N, 86° 46’ 56.1’’ W, coralline rock, Colls. SISV & LFCP, February 25, 2008 (1 spec) GoogleMaps   . [ ECOSUR] OH- P497, Quintana Roo, Cabo Catoche, 1 km off Cabo Catoche , 21° 36’ 49.47’’ N, 87° 6’ 8.93’’ W, Colls. SISV & LFCP, June 10, 2009 (1 spec) GoogleMaps   . [ ECOSUR] OH-P476, Yucatan, 1 km off Ria Lagarto beach, 21° 37’ 50’’ N, 88° 9’ 5’’ W, Colls. SISV & LFCP, June 14, 2009 (1 spec) GoogleMaps   . [ MCZ] Florida, 47064, 0.5 Km SE of entrance to Safe Harbor, stock island near Key West , 1.5 m, 24° 33.3’ N, 81° 43.8’ W, Coll. J. Thomas, July 29, 1977 (1 spec.) GoogleMaps   . [ USNM] North Carolina, 108231, 34 24’ 06’’ N, 76° 35’ 48’’ W, Coll. Duke University for MMS /BLM, October 22, 1981, Sta. 1505, on slow bay R / V, 18 m, Acc. 348038 (1 spec.) GoogleMaps   . Florida, 67959, St. Petersburg Beach , Coll. Salomon, C. H, January 29, 1966, Acc. No. 324461 (1 spec.)   . Off Florida, 130081, 25° 17’ 48’’ N, 81° 39’ 48’’ W, Coll. MML for MMS, December 10, 1982, Sta. 52, SOFLA 14 m, Acc. 345592 (1 spec.) GoogleMaps   . 18596, Everglades National Park , Shark River Delta, Sta. SRD, Coll. Heald, E. J, March 25, 1965 (1 spec.)   . Puerto Rico, 52061 Bahia de San Juan, Sta. 14, May 31, 1974 (1 spec.)   . Antigua, 24484 Antigua, Falmouth Harbor , Coll. University of Iowa, Summer 1918, Barbados /Antigua Expedition (1 spec.)   . Panama, 073019 Galeta Reef , Panama, Coll. A. A. Reimer, Acc. 318803 (4 specs)   .

Diagnosis. Eyes in all radioles (spherical); dorsal collar margins fused to faecal groove; caruncle present; interramal eyespots present; thoracic chaetae Type B; companion chaetae with teardrop and sickle-shaped membranes; abdominal chaetae narrowly hooded.

Description. Branchial crown longer than thorax with 15–27 pairs of radioles. Radioles purple with crossbanded yellowish-orange pigment extending to pinnules. Outer surfaces of radioles rounded. Sub-distal compound eyes present in all radioles, spherical, moderately larger on dorsalmost pair, gradually decreasing in size laterally and ventrally ( Fig. 16E–G View FIGURE 16 ). Radiolar tips longer gradually towards ventral radioles ( Fig. 16E–G View FIGURE 16 ). Dorsal collar margins square, fused to faecal groove ( Fig. 16A View FIGURE 16 ). Collar purple ventrally. Dorsal lappets absent. Dorsal pockets well developed ( Fig. 16A, D View FIGURE 16 ). Ventral lappets rounded, not overlapped ( Fig. 16B View FIGURE 16 ), as long as the ventral shield of collar. Anterior peristomial ring not exposed dorsally. Lateral collar margins covering base of radioles ( Fig. 16C View FIGURE 16 ). Dorsal lips erect, triangular, very long, with mid-rib. Dorsal pinnular appendages present. Ventral lips about a half as long as dorsal lips, broadly rounded. Ventral sacs absent. Caruncle placed above mouth, between dorsal lips, erect, triangular with rough surface ( Fig. 8B–C View FIGURE 8 ). Keel absent. Thorax purple dorsally, except for faecal groove. Total thorax-abdomen length 15–41 mm, maximum width 3–6 mm. Seven thoracic chaetigers. Interramal eyespots present. Thoracic tori longest on chaetigers 2–3. Tori in chaetigers 2–3 occupy the entire distance between notopodia and ventral shield margins ( Fig. 16B–C, H View FIGURE 16 ), all tori contacting shields. Inferior thoracic chaetae Type B ( Fig. 28D View FIGURE 28 ). Thoracic uncini with main fang surmounted by 10–13 rows of numerous minute teeth ( Fig. 28D View FIGURE 28 ), handles 2x length of main fang. Companion chaetae with teardrop and sickle-shaped membranes ( Fig. 28D View FIGURE 28 ). Abdomen with 78 chaetigers. Abdominal chaetae narrowly hooded. Abdominal uncini with main fang surmounted by 10–13 rows of numerous minute teeth. Pygidium broadly rounded with two groups of purple eyespots. Tube thick, rigid, covered with layer of mud with small pieces of sand and shell fragments.

BARCODE: Nucleotide sequences between 606–655 bp of the section of COI gene used for barcoding was obtained from three specimens, one from the Mexican Caribbean ( ECOSUR OH-P283), and two from the Gulf of Mexico ( ECOSUR OH-P476, ECOSUR OH-P497). The average evolutionary divergence over the three sequence pairs was 0.7   %.

Remarks. Megalomma lobiferum   ( Fig. 8B–C View FIGURE 8 ), M. acrophthalmos   ( Fig. 2D View FIGURE 2 ), M. carunculata   , M. pigmentum   ( Fig. 23H View FIGURE 23 ), M. sp., and M. quadrioculatum   share the presence of a caruncle (for differences among these species see remarks on M. carunculata   ). The caruncle of M. lobiferum   was characterized by Tovar-Hernández and Salazar- Vallejo (2008) as a structure innervated directly form the cerebral ganglion, supported with hyaline cartilage constituted by a homogeneous eosiniphilic matrix and hyperthrophied lateral bands of cilia, although its function is still unknown.

MCZ

Museum of Comparative Zoology

ECOSUR

El Colegio de la Frontera Sur (Mexico)

USNM

Smithsonian Institution, National Museum of Natural History

MMS

Montshire Museum of Science

R

Departamento de Geologia, Universidad de Chile

V

Royal British Columbia Museum - Herbarium

MML

Medical Microbiological Laboratory

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Carabidae

Genus

Megalomma

Loc

Megalomma lobiferum ( Ehlers, 1887 )

Tovar-Hernández, María Ana & Carrera-Parra, Luis F. 2011
2011
Loc

Megalomma lobiferum

Tovar-Hernandez, M. A. & Salazar-Vallejo, S. I. 2008: 1961
Tovar-Hernandez, M. A. & Salazar-Vallejo, S. I. 2006: 42
Perkins, T. H. 1984: 354
Hartman, O. 1959: 550
Hartman, O. 1951: 115
Johansson, K. E. 1927: 132
1927
Loc

Branchiomma lobiferum

Ehlers, E. 1887: 259
1887