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[WORM-LIKE ANIMALS]
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20a
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Animal worm-like (vermiform) or grub-like; body segmented or annulated (constricted in rings at regular intervals; may require some magnification; Fig. 1b)
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[21]
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20b
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Animal vermiform, but lacking multiple constrictions or repetitive external structures that indicate segmentation down the length of the body
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[18]
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~~~ |
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21a
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(17) & (20) |
Vermiform with more than 15 segments, all usually of similar diameter
~ Phylum ANNELIDA
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[35]
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21b
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Animal more grub-like with fewer than 15 total segments. {Shape somewhat fusiform (like a spindle, tapering down at both ends) or at least fatter through the middle. Larvae
~ Phylum ARTHROPODA ~ Class INSECTA ~ Order DIPTERA
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[134]
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22a
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(19) |
A single opening to digestive cavity (pharynx) located behind head on ventral surface; gastrovascular cavity with a single anterior branch and two postero-lateral branches. { Small (5 to 30 mm), flat worm with two eyespots on the head located beneath circular non-pigmented areas and between (usually) two triangular lateral projections (auricles). Freshwater streams and ponds. Planarian flatworm~ Phylum PLATYHELMINTHES ~ Class TURBELLARIA ~ Order TRICLADIDA ~ Family PLANARIIDAE
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[23]
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22b
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Mouth at front of head and anus near back end. {Small (1 to 30 mm), somewhat flattened worm without auricles, and two to four pairs of eyespots. Freshwater streams and ponds
~ Phylum NEMERTEA ~ Prostoma cf. graecense
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Flatworms refer to a group of small invertebrate animals in the Phylum Platyhelminthes. Flatworms are, of course, very flat. These are unsegmented worm-like critters (see Fig. 2, above) with but a single digestive track opening ("mouth") on the underside of the body. In Hawai‘i, numerous species of very colorful flatworms occur in reef environments (see Keoki & Yuko Stender-Marine Life Photography, Sea Slugs of Hawai‘i,or Flatworms of Maui). In freshwater, however, the diversity of flatworms is limited to but a few plain colored types that "glide" across the bottom of pools and are distinguished by somewhat goofy-looking paired eyspots and, in most cases, "ear-like" projections called auricles (Fig. 3).
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23a
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(22) |
Auricles (paired ear-like flaps near head end) are well-defined, arising distinct from lateral margin of body. Dorsal surface covered in gray to brown specks. Eyespots two, well-developed.
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[24]
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23b
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Auricles weakly developed or more-or-less absent, although body is generally widest across eye-spots
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[25]
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24a
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(23) |
Auricles elongated, sharply pointed. Worm up to 30 mm (1.2 in) long. Streams and pools Dugesia cf. dorotocephala (Woodworth)
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24b
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~1 mm by 7 mm long. Freshwater pools and streams flatworm "Type II"
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25a
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(23) |
Auricles evident as widening of body across well-developed eye-spots. Color transparent except for white internal organs and dorsal surface flecked with white and light tan, dark brown flecks along midline forming a small loop over mouth area. To 2 x 10 mm flatworm "Type I"
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25b
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Auricles absent, body hardly at all wider at eyespots than at mid-point. Eyes weakly developed and close to midline. Color transparent with white organs and numerous small white flecks. 0.5 mm by 4 mm flatworm "Type III"
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